BIO 200–Module 7 Qs – Flashcards

Which of the following did Gregor Mendel never see? A. a chromosome B. a stamen C. an F₂ generation D. a pea E. a hybrid

Mary, who has type O blood, is expecting a child with her husband, who has type B blood. Mary's husband's father has type A blood. What is the probability that the child will have type O blood? A. 0 percent B. 50 percent C. 100 percent D. 25 percent E. 75 percent

Two fruit flies are crossed, resulting in offspring with a 3:1 phenotypic ratio for a particular trait. This suggests A. that the parents were both homozygous for the gene associated with that trait. B. incomplete dominance. C. that one parent had complete dominance for the gene associated with that trait, while the other parent had incomplete dominance. D. that the one parent was heterozygous for the gene associated with that trait and the other parent was homozygous. E. that the parents were both heterozygous for the gene associated with that trait.

If a baby has "his father's nose," it's because the baby has A. inherited the “father's nose” allele from his mother. B. not inherited the “suppress father's nose allele” from his mother. C. inherited the “father's nose” allele from his father. D. inherited many alleles from his father that work together to shape the baby's nose. E. been cobbled together from a bunch of used parts.

Tay-Sachs, which is a recessive lethal disease, results only when individuals possess two copies of the disease-causing allele. Which of the following statements is TRUE about this disease? A. Heterozygous individuals may pass on their copy of the disease-causing allele to offspring. B. Heterozygous individuals only pass on the dominant copy of the allele to offspring. C. Heterozygous individuals are more fit than homozygous dominant individuals, so eventually, there will only be heterozygotes in the population. D. All cases of this disease must be caused by new mutations. E. None of the above answer choices is correct.

How can two pea plants that have different genotypes for seed color be identical in phenotype? A. One of the two plants could be homozygous for the dominant allele, while the other could be homozygous for the recessive allele. B. One of the two plants could be homozygous for the dominant allele, while the other could be heterozygous. C. Genotype has no relation to phenotype. D. Seed color in pea plants is not genetically determined. E. One of the two plants could be homozygous for the recessive allele, while the other could be heterozygous.

The ABO blood type system in humans is a system that contains ________ alleles that produce __________ different phenotypes. A. three; four B. three; six C. four; four D. four; three E. three; three

Which of the following pairings, indicated by letters referring to blood type phenotypes, CANNOT produce a child with type B blood? A. O × AB B. A × B C. B × O D. O × O E. All of the above can produce a child with type B blood.

Virtually everyone with ________ has a parent who exhibits the same trait. A. phenylketonuria B. freckles C. color-blindness D. sickle-cell disease E. a cleft chin

Gregor Mendel performed his famous experiments on A. hawkweed. B. humans. C. Darwin's finches. D. garden peas. E. pigeons.

A cross between homozygous red-eyed flies and homozygous white-eyed flies results in progeny that all have red-eyes. This result demonstrates A. a dihybrid cross. B. the norm of reaction. C. the blending model of genetics. D. the law of independent assortment. E. dominance.

The law of segregation states that A. gametes cannot be separate and equal. B. an allele on one chromosome will always segregate from an allele on a different chromosome. C. each of two alleles for a given trait segregate into different gametes. D. the transmission of genetic diseases within families is always recessive. E. the number of chromosomes in a cell is always divisible by 2.

In certain plants, red flowers are dominant to white flowers. If a heterozygous plant is crossed with a homozygous red-flowered plant, what is the probability that the offspring will be white-flowered? A. 25 percent B. 0 percent C. 50 percent D. 100 percent E. It depends on whether the traits are linked.

The phenotype of an organism can best be determined by A. sequencing its genes. B. inbreeding. C. outbreeding. D. a reciprocal cross. E. observing the organism.

Most genes come in alternative forms called A. dominants. B. recessives. C. alleles. D. chromosomes. E. gametes.

In pea plants, purple flower color is dominant to white flower color. If two pea plants that are true-breeding for white flowers are crossed, in the offspring A. all of the flowers will be purple. B. three-quarters of the flowers will be purple and one-quarter will be white. C. half of the flowers will be purple and half will be white. D. one-quarter of the flowers will be purple and three-quarters will be white. E. all of the flowers will be white.

In genetics, the separation of alleles or homologous chromosomes during meiosis so that the haploid daughter cells have one allele or the other, but never both, is also referred to as A. Mendel's first law. B. segregation. C. random genetic drift. D. Both the first and second answer choices are correct. E. All of the above answer choices are correct.

Which of the following is a single-gene trait? A. height B. the widow's peak hairline C. brown hair D. blue eyes E. All of the above answer choices are correct.

If a true-breeding blue-flowered plant was crossed with a true-breeding white-flowered plant, what phenotypic ratio would we observe in the progeny resulting from this cross? Assume the white-flowered trait is completely dominant. A. 100 percent blue B. 100 percent white C. 75 percent blue, 25 percent white D. 100 percent light blue E. Not enough information is provided to answer this question.

A true-breeding red rose is repeatedly mated with a true-breeding white rose, and all of their offspring are red. If two of these red offspring are mated, what percentage of their offspring will be red? A. 60 percent B. 100 percent C. 25 percent D. 50 percent E. 75 percent

Cystic fibrosis, which is usually lethal before reproductive ages, is a homozygous recessive disease. Why do cases continue to arise, even though people with the disease rarely live to reproduce? A. Mosquitoes can transfer the disease from person to person. B. The harmful allele can reside in heterozygous individuals with few to no negative effects. C. Individuals can pass on the alleles in non-genetic ways, including through the sharing of needles. D. People continue to make unhealthy lifestyle choices. E. Cystic fibrosis is a multifactorial disorder, and is probably controlled by the action of many genes.

A woman with type B blood and a man with type A blood could have children with which of the following phenotypes? A. A, B, AB, or O B. A, B, or O C. AB or O D. O only E. AB only